Comments

If you can give us the specific code you used, that would help. Probably this indicates some bug in our our padding for the legend, or some customization we haven't wrapped yet, but it's hard to be sure.

Which version does that work in? I tried copy&pasting your code in notebook and in sage prompt, and it doesn't work for me in 4.5.3. I get a RuntimeError in line(), illegal option `legend_label`. Are you using some other plot lib? Can you complete your example with the necessary import ... in that case?